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Exchange rates and fundamentals: a generalization

James Nason () and John Rogers

No 2008-16, FRB Atlanta Working Paper from Federal Reserve Bank of Atlanta

Abstract: Exchange rates have raised the ire of economists for more than twenty years. The problem is that few, if any, exchange rate models are known to systematically beat a naive random walk in out-of-sample forecasts. Engel and West (2005) show that these failures can be explained by the standard present value model (PVM) because it predicts random walk exchange rate dynamics if the discount factor approaches one and fundamentals have a unit root. This paper generalizes the Engel and West hypothesis to the larger class of open economy dynamic stochastic general equilibrium (DSGE) models. The Engel and West hypothesis is shown to hold for a canonical open economy DSGE model. We show that all the predictions of the standard PVM carry over to the DSGE PVM. The DSGE PVM also yields unobserved components (UC) models that we estimate using Bayesian methods and a quarterly Canadian-U.S. sample. Bayesian model evaluation reveals that the data support a UC model that calibrates the discount factor to one, implying the Canadian dollar?U.S. dollar exchange rate is a random walk dominated by permanent cross-country monetary and productivity shocks.

Keywords: Foreign; exchange; rates (search for similar items in EconPapers)
Date: 2008
New Economics Papers: this item is included in nep-cba, nep-dge, nep-ifn, nep-mon and nep-opm
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